<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>box-sizing探究</title>
</head>
<body>
    <div>芜湖~~
        芜湖~
    </div>
    <div class="tri"></div>
    <br>
    <p><a href="./个人主页.html">个人主页</a></p>
</body>
<style>
    div{
        box-sizing: border-box;
        border: green 10px solid;
        width: 100px;
        height: 80px;
        margin: 30px;

    }
    .tri{
        box-sizing: border-box;
        width: 10px;
        border-top: 50px dashed red;
        border-right:50px dashed transparent;
        border-bottom: 50px dashed transparent;
        border-left: 50px dashed transparent;
    }
</style>
</html>